US3881081A - Trigger mechanism for a power tool - Google Patents

Trigger mechanism for a power tool Download PDF

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Publication number
US3881081A
US3881081A US422597A US42259773A US3881081A US 3881081 A US3881081 A US 3881081A US 422597 A US422597 A US 422597A US 42259773 A US42259773 A US 42259773A US 3881081 A US3881081 A US 3881081A
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US
United States
Prior art keywords
trigger
latch member
switch
power tool
displacement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US422597A
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English (en)
Inventor
Rainer Schilling
Ladislaus Ferenczefy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3881081A publication Critical patent/US3881081A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/20—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling

Definitions

  • An electromotor-driven power tool has a trigger mechanism controlling the operation of the electromotor.
  • the trigger mechanism comprises a trigger constructed as an one-arm lever pivotable between an inactive and an active position in which latter it activates a switch controlling the supply of electric power to the electromotor.
  • a latch member is supported in the trigger so as to be movable with respect thereto from a latching position in which it prevents the trigger from'being displaced, to an intermediate positionin which it permits displacement of the trigger into the active position thereof and its immediate return into the inactive position once a pressure exerted on the trigger is relieved, and beyond the intermediate position to a locking position in which the trigger is retained in the active position until the latch member is released either by deliberate action of the operator or by an impact.
  • the present invention relates to power tools in general, and to electromotor-driven power tools in particular. Even more particularly, the present invention relates to a trigger mechanism for use in an electromotordriven power tool.
  • one feature of the invention resides in the provision of a latch member which is supported in a trigger member so as to be movable substantially transversely to the direction of movement of the trigger member between a latching position in which it prevents the trigger member from moving, through an intermediate position in which it permits the trigger member to move into an active position so as to activate a switch controlling the supply of electric currentto the electromotor, and into a locking position in which it retains the trigger member in the active position thereof.
  • the trigger member is permitted to move in response to a force exerted upon it by the operator so that the switch is activated and the electromotor of the power tool operates as long as the force is being exerted upon the trigger member, while the trigger member is free to return toits'original position upon discontinuance of the force, with attendant return of the latch member into its original latching position.
  • the intermittent operation of the power tool requires deliberate displacement of the latch member from its latching position into its intermediate position and subsequent displacement of the trigger member.
  • a further deliberate action on the part of the operator is required in displacing the latch member even farther with respect to the trigger member from the intermediate position into the locking position.
  • the latch member is supported in the trigger memberfor movement transversely of the direction of movement of the trigger member itself, and the trigger member is provided with two steppedabutments generally corresponding to the intermediate and the locking position of the latch member.
  • the operator When it is desired to lock the trigger member in its active position, the operator has to lift at least that finger which contacts the latch member off the trigger member so as to be able to push the latch member beyond its intermediate position toward the second abutment and thus into its locking position.
  • the conversion from an intermittent to a continuous operation of the power tool is the result of a deliberate action of the operator. Consequently, the danger that the operator may suffer injuries as a result of the latch member being in the locking position without knowledge about this fact on part of the operator, is eliminated.
  • the latch member is retained in its locking position with a force which is only sufficient to retain the latch member during the normal operation of the power tool.
  • FIG. 1 is a side elevational view of a power tool utilizing a trigger mechanism according to the invention
  • FIG. 2 is a detailed, partially sectioned view of the handle of the power tool according to FIG. 1 showing the trigger mechanism;
  • FIG. 3 is a detailed, partly sectioned view of a trigger of the trigger mechanism.
  • FIG. 4 is a detailed, partly sectioned view of a latch member of the trigger mechanism.
  • a power tool which is illustrated in FIG. 1 as a sander but which is not limited to this particular embodiment, comprises a housing which, in a known manner,
  • main portion 1 accommodating an electromotor M, a head 2 connected to the main portion 1 and accommodating a transmission T for driving a tool, such as a sander plate 3, and a handle 4 which is shown in more detail in FIG. 2 and which extends from the main portion 1.
  • An electric switch 5 of conventional design known per se is accommodated within the handle 4 and is adapted to control the supply of electric current to the electromotor M.
  • a trigger 6 which is constructed as an elongated one-armed lever is attached to the handle 4 so as to be pivotable in a limited range about a pin 6.
  • a further pin 7 connects an actuating rod 7 to the trigger 6, the rod 7 being accommodated in the switch 5 and adapted to activate the same. Biasing means.
  • FIG. 2 shows the trigger in its undepressed position.
  • the free end of the trigger 6 is provided with a guide 9 for guiding a latch member 10.
  • the guide 9 comprises two lateral walls each of which is provided with a guide rail 11.
  • the latch member 10 is provided with a pair of grooves 12 which are adapted to accommodate the guide rails 11 of the lateral walls of the guide 9. Once the guide rails 11 are inserted into the grooves 12, the latch member 10 is supported in the trigger 6 for displacement with respect thereto in a direction determined by the orientation of the grooves 12. It is to be understood that instead of being provided in the latch member 10, the grooves may also be provided in the guide 9; then, of course, the latch member 10 is formed with corresponding guide rails.
  • the grooves 12, and consequently also the guide rails 11 extend substantially longitudinally of the trigger 6, so that the latch member 10 is displaceable substantially normally to the direction of movement of the trigger 6 about the pin 6'.
  • a support plate 21 is arranged between the lateral walls of the guide 9, and the latch member 10 is provided with a bore 13 which extends parallel to the grooves 12.
  • Biasing means, such as a spring 14 is accommodated in the bore 13 and abuts against the plate 21, biasing the latch member 10 away from the plate 21 toward a latching position of the latch member 10.
  • the latch member 10 is further formed with a stop 15 and a recess 18 cooperating with a catch 16 which is fixed with respect to the handle 4, being attached to a stationary part thereof, such as to the switch 5.
  • the catch 16 is preferably an angular part made of sheet material and cooperates with the latch member 10 in such a manner as to prevent inadvertent displacement of the trigger 6 when the latch member 10 is in its latching position as shown in the drawing, and thus to prevent possible injuries to the operator which could otherwise occur if the trigger 6 were permitted to move and, consequently, to activate the electromotor M and thus the sanding plate 3 every time the operator touches the trigger 6.
  • the lateral walls of the guide 9 have a stepped configuration, being formed with a first abutment l7 and a second abutment 19, generally corresponding to an intermediate and a locking position of the latch member 10, respectively.
  • the latch member 10 further comprises a projection 20 which extends into the recess 18. The function of these abutments and this projection will be explained hereafter.
  • the latch element 10 is pushed beyond its intermediate position into its locking position.
  • another deliberate action is required from the operator of the power tool; namely, he has to lift at least one finger from the trigger 6 so as to be able to push the latch member 10 beyond its position in which it registers with the first abutment 17 and toward the second abutment 19.
  • the latch member 10 has to be displaced into its intermediate position and the trigger 6 has to be displaced into its active position so that the electromotor is activated and the catch 16 extends into the recess 18.
  • the projection 20 faces an angular end portion 16 of the catch 16 and if the pressure on the trigger is now released while the latch member is held in the locking position, the projection 20 abuts against the angular end portion 16 of the catch 16 so that the friction between the projection 20 and the angular end portion 16' of the catch 16 prevents the latch member 10 from returning into its intermediate position and from there into its latching position with attendant stoppage of the electromotor M.
  • an additional spring 14' is attached to the plate 21 in such a manner that it abuts against the latch member 10 once the latter is displaced beyond its intermediate position, so that the biasing force the operator of the power tool has to overcome when displacing the latch member 10 from the intermediate position toward the locking position thereof increases significantly when compared with the force which he has to overcome during the displacement of the latch member 10 from the latching position into the intermediate position thereof.
  • This is an additional-safeguard purporting to avoid the displacement of the latch member 10 into its locking position without the operator of the power tool being aware of this fact.
  • the biasing force exerted on the latch member 10 by the two springs 14 and 14' is so selected as to be equal to or only slightly smaller than the friction force between the projection 20 of the latching member 10 and the angular end portion 16 of the catch 16. Consequently, the catch 16 safely retains the latch member 10 in its locking position under normal operating conditions until the operator decides to discontinue the operation by exerting pressure on the trigger 6 so that the projection 20 is lifted off the angular end portion 16 of the catch 16 with attendant elimination of the friction force, so that the combined action of the springs 14 and 14 shifts the latch member 10 into its intermediate position from which it is allowed to return into the latching position once the pressure on the trigger 6 is relieved.
  • the invention has been described as incorporated in a power tool having an intermittent and a continuous setting, it could also be used in a power tool working only under intermittent conditions; in this case, the projection 20 could be omitted and the latch member would be displaceable only between a latching position and a working position corresponding to the intermediate position as described above, having still the same advantages as those previously described when discussing the latching and the intermediate positions of the latch member 10. It is also possible to dispose of the second spring 14' so that there is no stepwise increase in the force the operator has to overcome when pushing the latch member 10 beyond the intermediate position thereof, without appreciable decrease in the reliability of the device.
  • the angular end portion of the catch 16 with an aperture adapted to accept the projection 20. It is equally possible, if so desired, to omit the angular end portion 16' of the catch 16 entirely the catch 16 is then a strip which has been bent only onceand to provide a cutout therein which is adapted to accept a projection of the latch member 10 therein.
  • a power tool having an electrically energizable drive controlled by a switch and accommodated in a housing, a combination comprising a trigger connected with the switch and mounted on the housing for displacement with respect thereto between a deenergizing position in which the switch is open and an energizing position in which the switch is closed whereby the drive is energized; biasing means urging said trigger toward said deenergizing position; a latch member mounted on said trigger to share the displacement thereof and also for movement with respect to said trigger between a first, a second, and a third position; and means on the housing operative for engaging said latch member when the same is in said first position so as to prevent displacement of said trigger toward said energizing position, for disengaging said latch member when the same is in said second position so as to permit displacement of said trigger against the force of said biasing means toward said energizing position, and for reengaging said latch member when the same is subsequently moved to said third position while said trigger is in said energizing
  • said trigger is an elongated lever supported in the housing for pivotal movement.
  • biasing means is a spring acting on said trigger so as to pivotally displace the same toward said deenergizing position.
  • said means comprising a catch affixed to the housing and having a projecting portion; and wherein said latch member comprises a stop located opposite said projecting portion when said latch member is in said first position, and is further provided with a recess adapted to accept said projecting portion subsequently to the displacement of said latch member into said second position and of said trigger into said energizing position.
  • a combination comprising a trigger movable in a first direction between a first position in which the switch is open and a second position in which the switch is closed whereby the drive is energized, said trigger being formed with a guide means comprising a first and a second abutment; biasing means urging said trigger toward said first position; a latch member supported by said guide means of said trigger for movement with respect thereto in a second direction substantially normal to said first direction between a latch position in which said latch member prevents said trigger from being displaced, a working position in which said latch member registers with said first abutment and permits displacement of said trigger into said second position in response to a pressure exerted upon said trigger, and permits the return of said trigger into said first position under the urging of said biasing means subsequently to relief of the pressure upon said trigger, and a locking position in which the latch member registers with said second abutment and
  • a combination comprising a trigger in a first direction between a first position in which the switch is open and a second position in which the switch is closed whereby the drive is energized; biasing means urging said trigger toward said first position; a latch member supported by said trigger for movement with respect thereto in a second direction substantially normal to said first direction and between a latching position in which said latch member prevents said trigger from being displaced, a working position in which said latch member permits displacement of said trigger into said second position in response to a pressure exerted upon said trigger, and permits the return of said trigger into said first position under the urging of said biasing means subsequently to relief of the pressure upon said trigger; and additional biasing means urging said latch member toward said latching position thereof.
  • biasing means is a spring accommodated in said latch member and abutting against a portion of said trigger.
  • a combination as defined in claim 7, comprising an additional spring attached to said portion of said trigger and abutting against said latch member subsequently to movement thereof beyond said working position toward said locking position.
  • a combination comprising a trigger formed as an elongated lever supported in the handle of the power tool for pivotal movement in a first direction between a first position in which the switch is open and a second position in which the switch is closed whereby the drive is energized; biasing means urging said trigger toward said first position; a latch member supported by said trigger for movement with respect thereto in a second direction substantially normal to said first direction and substantially coinciding with the longitudinal direction of said trigger between a latching position in which said latch member prevents said trigger from being displaced, a working position in which siad latch member permits displacement of said trigger into said second position in response to a pressure exerted upon said trigger, and permits the return of said trigger into said first position under the urging of said biasing means subsequently to relief of the pressure upon said trigger and a locking position subsequently to the displacement of said trigger into said second position; and means for retaining said trigger in said
  • said projecting portion is provided with an angular end portion
  • said latch member is provided with a recess adapted to accommodate said projecting portion subsequently to displacement of said latch member into said working position and of said trigger into said second position and between said working position and said locking position of said latching member; and wherein said projection extends into said recess so as to engage said angular end portion of said catch.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US422597A 1973-03-30 1973-12-12 Trigger mechanism for a power tool Expired - Lifetime US3881081A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2315841A DE2315841C3 (de) 1973-03-30 1973-03-30 Im Handgriff einer elektromotorisch angetriebenen Handwerkzeugmaschine angeordnete Betätigungsvorrichtung

Publications (1)

Publication Number Publication Date
US3881081A true US3881081A (en) 1975-04-29

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ID=5876412

Family Applications (1)

Application Number Title Priority Date Filing Date
US422597A Expired - Lifetime US3881081A (en) 1973-03-30 1973-12-12 Trigger mechanism for a power tool

Country Status (9)

Country Link
US (1) US3881081A (sv)
BR (1) BR7402451D0 (sv)
CH (1) CH563839A5 (sv)
DE (1) DE2315841C3 (sv)
ES (1) ES424783A1 (sv)
FR (1) FR2223965A5 (sv)
GB (1) GB1462514A (sv)
IT (1) IT1069261B (sv)
NL (1) NL173798C (sv)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192982A (en) * 1977-08-13 1980-03-11 Metabowerke Gmbh & Co. Deadman's switch
DE3201744A1 (de) * 1982-01-21 1983-07-28 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Schaltschieber fuer elektrowerkzeuge
US4970355A (en) * 1988-07-28 1990-11-13 Robert Bosch Gmbh Safety device in an electrically powered machine, especially a hand-held power tool
US5570776A (en) * 1994-03-03 1996-11-05 Black & Decker Inc. Switch arrangement, particularly for a router
US5577600A (en) * 1995-11-21 1996-11-26 Emerson Electric Co. Switch lock-out device for power tool
FR2740065A1 (fr) * 1995-10-20 1997-04-25 Waxing Corp Of America Inc Outil a moteur
US5988241A (en) * 1998-11-16 1999-11-23 Porter-Cable Corporation Ergonomic router handles
US5998897A (en) * 1998-11-16 1999-12-07 Porter-Cable Corporation Router chuck mounting system
US6065912A (en) * 1998-11-16 2000-05-23 Porter-Cable Corporation Router switching system
US6079915A (en) * 1998-11-16 2000-06-27 Porter-Cable Corporation Plunge router depth stop system
US6113323A (en) * 1998-11-16 2000-09-05 Porter-Cable Corporation Plunge router sub-base alignment
US6139229A (en) * 1998-11-16 2000-10-31 Porter-Cable Corporation Plunge router fine depth adjustment system
US6169258B1 (en) * 1996-12-31 2001-01-02 Matsushita Electric Corporation Of America Three position control switch assembly
US6261036B1 (en) 1998-11-16 2001-07-17 Porter-Cable Corporation Plunge router locking system
US20030062250A1 (en) * 2001-09-29 2003-04-03 Ernst Kraenzler Electric hand power tool with switching key
US20030117095A1 (en) * 2001-08-06 2003-06-26 Bhanu Gorti Excitation circuit and control method for flux switching motor
US20040155532A1 (en) * 2003-02-07 2004-08-12 Brotto Daniele C. Method for sensing switch closure to prevent inadvertent startup
US7232970B1 (en) * 2005-06-03 2007-06-19 Li-Hsueh Chen Safety start switch for a pneumatic tool
US20080008551A1 (en) * 2005-07-07 2008-01-10 Black & Decker Inc. Router
CN103153548A (zh) * 2010-09-29 2013-06-12 株式会社牧田 电动工具
US8853578B2 (en) 2009-12-18 2014-10-07 Milwaukee Electric Tool Corporation Multi motion switch with multiplier arm
US8872049B2 (en) 2012-04-18 2014-10-28 Milwaukee Electric Tool Corporation Trigger lock-on lock-off mechanism
US20150170848A1 (en) * 2013-12-17 2015-06-18 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
US9321155B2 (en) 2010-01-07 2016-04-26 Black & Decker Inc. Power tool having switch and rotary input control
EP3070728A1 (en) * 2015-03-20 2016-09-21 Izumi Products Company Electric tool
US10892122B2 (en) * 2019-04-26 2021-01-12 Defond Electech Co., Ltd. Trigger assembly with a protective covering

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2850120A1 (de) * 1977-11-21 1979-05-23 Black & Decker Mfg Co Schalter-betaetigungseinrichtung
DE3104733C3 (de) * 1981-02-11 1997-01-09 Reich Maschf Gmbh Karl Schalter für Elektrowerkzeuge
DE3838836C1 (sv) * 1988-11-17 1990-05-10 Robert Bosch Gmbh, 7000 Stuttgart, De
GB2263197A (en) * 1991-12-20 1993-07-14 Desoutter Ltd Safety lever assembly for a power tool
DE4229756A1 (de) * 1992-09-05 1994-03-10 Abb Patent Gmbh Elektrisches Schaltgerät
DE4433083A1 (de) * 1994-09-16 1996-03-21 Kopp Heinrich Ag Vorrichtung zur mechanischen Sicherung einer Schaltstellung eines elektrischen Druckschalters
JP3844897B2 (ja) * 1998-12-04 2006-11-15 株式会社マキタ 電動工具のスイッチ

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US2676217A (en) * 1952-05-20 1954-04-20 Garbs Raymond Flashlight switch
US2701288A (en) * 1953-06-25 1955-02-01 Pass & Seymour Inc Switch operating trigger with sliding lock
US2789170A (en) * 1956-01-09 1957-04-16 Arrow Hart & Hegeman Electric Trigger switch with lock-on and interlock
US3329789A (en) * 1965-11-05 1967-07-04 Carling Electric Inc Multi-position lock for trigger switch
US3379852A (en) * 1966-03-02 1968-04-23 Scovill Manufacturing Co Power operated knife switch trigger locking means

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US1929662A (en) * 1930-08-16 1933-10-10 Wappat Inc Motor driven tool switch
DE1263901B (de) * 1964-02-22 1968-03-21 Marquardt J & J Anordnung zur Schaltstellungsverriegelung von Schaltgeraeten, insbesondere von Geraeteschaltern mit Abhebekontakten
US3662136A (en) * 1971-05-20 1972-05-09 Leviton Manufacturing Co Trigger mechanism for power tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2676217A (en) * 1952-05-20 1954-04-20 Garbs Raymond Flashlight switch
US2701288A (en) * 1953-06-25 1955-02-01 Pass & Seymour Inc Switch operating trigger with sliding lock
US2789170A (en) * 1956-01-09 1957-04-16 Arrow Hart & Hegeman Electric Trigger switch with lock-on and interlock
US3329789A (en) * 1965-11-05 1967-07-04 Carling Electric Inc Multi-position lock for trigger switch
US3379852A (en) * 1966-03-02 1968-04-23 Scovill Manufacturing Co Power operated knife switch trigger locking means

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192982A (en) * 1977-08-13 1980-03-11 Metabowerke Gmbh & Co. Deadman's switch
DE3201744A1 (de) * 1982-01-21 1983-07-28 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Schaltschieber fuer elektrowerkzeuge
US4970355A (en) * 1988-07-28 1990-11-13 Robert Bosch Gmbh Safety device in an electrically powered machine, especially a hand-held power tool
US5570776A (en) * 1994-03-03 1996-11-05 Black & Decker Inc. Switch arrangement, particularly for a router
FR2740065A1 (fr) * 1995-10-20 1997-04-25 Waxing Corp Of America Inc Outil a moteur
US5577600A (en) * 1995-11-21 1996-11-26 Emerson Electric Co. Switch lock-out device for power tool
US6169258B1 (en) * 1996-12-31 2001-01-02 Matsushita Electric Corporation Of America Three position control switch assembly
US5988241A (en) * 1998-11-16 1999-11-23 Porter-Cable Corporation Ergonomic router handles
US6065912A (en) * 1998-11-16 2000-05-23 Porter-Cable Corporation Router switching system
US6079915A (en) * 1998-11-16 2000-06-27 Porter-Cable Corporation Plunge router depth stop system
US6113323A (en) * 1998-11-16 2000-09-05 Porter-Cable Corporation Plunge router sub-base alignment
US6139229A (en) * 1998-11-16 2000-10-31 Porter-Cable Corporation Plunge router fine depth adjustment system
US5998897A (en) * 1998-11-16 1999-12-07 Porter-Cable Corporation Router chuck mounting system
US6261036B1 (en) 1998-11-16 2001-07-17 Porter-Cable Corporation Plunge router locking system
US6943510B2 (en) 2001-08-06 2005-09-13 Black & Decker Inc. Excitation circuit and control method for flux switching motor
US20030117095A1 (en) * 2001-08-06 2003-06-26 Bhanu Gorti Excitation circuit and control method for flux switching motor
US6794593B2 (en) * 2001-09-29 2004-09-21 Robert Bosch Gmbh Electric hand power tool with switching key
US20030062250A1 (en) * 2001-09-29 2003-04-03 Ernst Kraenzler Electric hand power tool with switching key
US20040155532A1 (en) * 2003-02-07 2004-08-12 Brotto Daniele C. Method for sensing switch closure to prevent inadvertent startup
US7112900B2 (en) 2003-02-07 2006-09-26 Black & Decker Inc. Method and system for sensing switch position to prevent inadvertent startup of a motor
US7232970B1 (en) * 2005-06-03 2007-06-19 Li-Hsueh Chen Safety start switch for a pneumatic tool
US20080008551A1 (en) * 2005-07-07 2008-01-10 Black & Decker Inc. Router
US7484915B2 (en) 2005-07-07 2009-02-03 Black & Decker Inc. Router
US20090114314A1 (en) * 2005-07-07 2009-05-07 Black & Decker Inc. Router
US8146629B2 (en) 2005-07-07 2012-04-03 Black & Decker, Inc. Router
US8853578B2 (en) 2009-12-18 2014-10-07 Milwaukee Electric Tool Corporation Multi motion switch with multiplier arm
US9321155B2 (en) 2010-01-07 2016-04-26 Black & Decker Inc. Power tool having switch and rotary input control
US20130175961A1 (en) * 2010-09-29 2013-07-11 Makita Corporation Electric power tool
CN103153548A (zh) * 2010-09-29 2013-06-12 株式会社牧田 电动工具
CN103153548B (zh) * 2010-09-29 2016-06-22 株式会社牧田 电动工具
US8872049B2 (en) 2012-04-18 2014-10-28 Milwaukee Electric Tool Corporation Trigger lock-on lock-off mechanism
US20150170848A1 (en) * 2013-12-17 2015-06-18 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
US10014128B2 (en) * 2013-12-17 2018-07-03 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
EP3070728A1 (en) * 2015-03-20 2016-09-21 Izumi Products Company Electric tool
CN105983953A (zh) * 2015-03-20 2016-10-05 株式会社泉精器制作所 电动工具
US10892122B2 (en) * 2019-04-26 2021-01-12 Defond Electech Co., Ltd. Trigger assembly with a protective covering

Also Published As

Publication number Publication date
DE2315841A1 (de) 1974-10-10
NL7404314A (sv) 1974-10-02
DE2315841B2 (de) 1981-01-08
GB1462514A (en) 1977-01-26
ES424783A1 (es) 1976-06-01
IT1069261B (it) 1985-03-25
CH563839A5 (sv) 1975-07-15
BR7402451D0 (pt) 1974-11-19
DE2315841C3 (de) 1981-11-19
NL173798C (nl) 1984-03-01
FR2223965A5 (sv) 1974-10-25

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